package com.google.code.springwt.client.pattern;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import com.google.gwt.user.client.ui.Composite;

/**
 * Support class for composite Widget to implement the Observale interface
 * 
 * @author ndeloof
 */
public class ObserableComposite<T>
    extends Composite
    implements Observable<T>
{
    private ListenerCollection<T> listeners = new ListenerCollection<T>();

    public void addListerner( Listener<Event<T>> listener )
    {
        listeners.add( listener );
    }

    public void removeListerner( Listener<Event<T>> listener )
    {
        listeners.remove( listener );
    }

    protected void fireEvent( Event<T> event )
    {
        for ( Listener<Event<T>> listener : listeners )
        {
            listener.on( event );
        }
    }
}
